T5 技巧 2：为Grid组件的每一行增加“删除/修改”链接。

package com.javaeye.dengyin2000.gtts.utils;

import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.apache.commons.lang.StringUtils;
import org.apache.tapestry.beaneditor.PropertyModel;
import org.apache.tapestry.grid.GridDataSource;

import com.javaeye.dengyin2000.gtts.domain.Driver;
import com.javaeye.dengyin2000.gtts.genericdao.Page;
import com.javaeye.dengyin2000.gtts.service.BussnissService;

public class DriverGridDataSource implements GridDataSource {

	private String nameQueryString;
	
	private int pageSize;
	
	private BussnissService service;
	
	private int totalCount;
	
	private Map<Integer, Driver> currentDatas = new HashMap<Integer, Driver>();
	
	public DriverGridDataSource(String string, int pageSize, BussnissService service){
		this.nameQueryString = string;
		this.pageSize = pageSize;
		this.service = service;
	}
	
	public int getAvailableRows() {
		if (totalCount == 0)
			this.totalCount = service.getDomainsCount(getHqlString(), getParams());
		return totalCount;
	}

	public Class getRowType() {
		return Driver.class;
	}

	public Object getRowValue(int index) {
		return currentDatas.get(index);
	}


	@SuppressWarnings("unchecked")
	public void prepare(int startIndex, int endIndex, PropertyModel sortModel,
			boolean ascending) {
		Page page = null;
		if (sortModel == null)
			page = service.pagedQuery(getHqlString(), startIndex, pageSize, null, false, getParams(), this.totalCount);
		else
			page = service.pagedQuery(getHqlString(), startIndex, pageSize, sortModel.getPropertyName(), ascending, getParams(),this.totalCount);
		List<Driver> result = (List<Driver>) page.getResult();
		currentDatas.clear();
		for(int i=0; i<result.size(); i++){
			currentDatas.put(startIndex+i, result.get(i));
		}
	}
	
	private String getHqlString(){
		String hql = "from Driver where 1=1";
		if (StringUtils.isNotBlank(nameQueryString)){
			hql = hql + " and name like :name";
		}
		return hql;
	}

	private Map<String, Object> getParams(){
		Map<String, Object> params = new HashMap<String, Object>();
		if (StringUtils.isNotBlank(nameQueryString)){
			params.put("name", "%" + nameQueryString + "%");
		}
		return params;
	}

	public void setTotalCount(int totalCount) {
		this.totalCount = totalCount;
	}
	
	
}

package com.javaeye.dengyin2000.gtts.pages.basicinformation;

import java.util.ArrayList;
import java.util.List;

import org.apache.tapestry.Block;
import org.apache.tapestry.annotations.Component;
import org.apache.tapestry.annotations.Inject;
import org.apache.tapestry.annotations.Persist;
import org.apache.tapestry.beaneditor.BeanModel;
import org.apache.tapestry.corelib.components.Grid;
import org.apache.tapestry.grid.GridDataSource;
import org.apache.tapestry.services.BeanModelSource;

import com.javaeye.dengyin2000.gtts.base.BasePage;
import com.javaeye.dengyin2000.gtts.domain.Driver;
import com.javaeye.dengyin2000.gtts.utils.DriverGridDataSource;
import com.javaeye.dengyin2000.gtts.utils.MiscUtils;

public class Drivers extends BasePage {
	
	@Inject
	private BeanModelSource beanModelSource;
	
	@Inject
	private Block nodata;
	
	@Component(id="driverGrid")
	private Grid driverGrid;
	
	private String driverName;
	
	private Driver currentRow;
	
	@Persist
	private GridDataSource dataSource;

	public String getDriverName() {
		return driverName;
	}

	public void setDriverName(String driverName) {
		this.driverName = driverName;
	}
	
	public BeanModel getDriverBeanModel(){
		return MiscUtils.buildDriverBeanModel(beanModelSource, getComponentSources());
	}
	
	public GridDataSource getDriverSource(){
		if (dataSource == null) {
			dataSource = new DriverGridDataSource(getDriverName(), driverGrid.getRowsPerPage(), getBussnissService());
		}
		 // fouce the grid to refetch the count;  
		 ((DriverGridDataSource)dataSource).setTotalCount(0);
		 return dataSource;
	}
	
	void onActionFromDeleteLink(int driverId){
		List<Integer> deleteIds = new ArrayList<Integer>();
		deleteIds.add(driverId);
		getBussnissService().deleteDrivers(deleteIds);
		setMessage("删除成功！");
	}

	public Block getNodata() {
		return nodata;
	}

	public Driver getCurrentRow() {
		return currentRow;
	}

	public void setCurrentRow(Driver currentRow) {
		this.currentRow = currentRow;
	}
}